Electric-light-socket cap.



J. H. eoss, ELECTRIC LIGHT SOCKET GAP. APPLICATION FILED JAN. 3. 1911.

1,00 51,v Patented Oct. 24, 1911 WITNESSES [NVENTOR wa /M Aua mey UNITEDSTATES PATENT OFFICE.

JOHN-IE. Goss, or wnti'isinnumr,v CONNECTICUT, nssrenoa T0 scovILLnurtures TUBING COMPANY, OF

WAIEBBUBY, Nncrrcnr.

/ Specification of Letters Patent.

CONNECTICUT, A GORPORATIQN or con-- nLEcrRIo-LmHr-socmr m."

- Patented Oct. 24, 1911.

Application filed January 3,'1911. Serial No. 600,538.

The object of the invention is t6 provide for the attachment to the capof the hub used to securethe socket to a fixture, in such way as toprevent the loosening of the joint of the cap and hub by the twistingstrains incidentto screwing the socket on, to the fixture, and to permitthe use of comparatively thick sheet metal in the manufacture of thecap.

The invention consists of a cap having a hub-hole surrounded by anoutwardly extending straight, upright, circular flange.

and a hub having a flange to enter the hub I hole, and a surroundinggroove to receive the hub-hole flange, (said last .mentioned flangehereinafter being referred to as the cap-flange), the hub flange beingexpanded, headed-up, or staked flat over the" inside of the cap adjacentto its hub-hole, in a horizontal or parallel plane and there-v bydrawing the cap-flange into the hubvgroove and effecting a firm union ofthe cap and hub capable of resisting the twisting strains to which thesocket is exposed in screwing it, .by means of its hub, to thesupporting fixture. This strain-resisting effect may be augmented bynurling or milling or' otherwise roughening the outer. surface of thehub flange where it comes into contact with the cap and its flange.

In the accompanying drawings, illustrating the invention, in the severalfigures of which like parts are similarly designated,-

Figure 1 shows in cross-section the two parts of the cap construction.Fig. 2 is a bottom plan view, and Fig. 3 is a side view ofthe hubdetached. Fig. 4 is a top plan view of the cap detached. Fig. 5 is a bottom or inside plan view; Fig. '6 is a cross section, and Fig. 7 is a topplan view of the finished cap.

The cap or shell 1 is of any approved design or configuration, with orwith ut the encircling band 2 at its base, and having the hub-hole 3.The hub-hole is surrounded by the recess 4. A straight flange 5 isformed around the hub-hole and extends outwardl therefrom, in otherwords, stands outsid of the cap. This flange iscircular by. prefverence. 1

The hub 6 has the flange 7 and the slit rounding groove 8 cut in theshoulder 9 adjacent to the hub flange, and of a size to receive the capflange 5; The external surface of the hub flange may be knurled, milled,or otherwise roughened, as shown in or, grip upon the adjacent metal ofthe cap when the two are united. v

1 10 is a set-screw for fixing the socket to the supporting fixture whenscrewed down thereon.

The hub has its flange inserted in the hubing tools the hub and capflange are'forced" into intimate union, the hub flange being turned outhorizontally or substantially at right angles to the longitudinal axisof the inside of the cap within its recess 4, as seen in Figs. 5 and 6.In this operation of uniting the hub and cap, the hub-flange may bemoreor less split, or it; may remain; whole; and the cated in Fig. 6, but itis designed to have-such staking ofthe hub flange against the inside ofthe cap will drawthe two into 'a union ordinary twisting strains towhich the de vice is exposed in screwing the socket to its fixture, andwithout material deformation or folding of the cap flange. It will beobserved that the flattening out of the hub flange in the recess 4:, asdescribed, extends this flange, when set, beneath the shoulder 9, sothat the metal of the'cap is gripped between said flattened out flangeand said shoulder, I thus. permitting the described drawing of the huband cap into an effective strain-resisting union, and permitting thegrip of the hub on the cap will be enhanced, by the nurling on the hubflange, said nurling crossing the line of direction of the twlstingstrain at right angles.

By' the construction.described, a. shorter hub, and clenched flat orparallel against the cap flange may be more or lessbent, as indi;-

use of thick or heavy metal in the cap. The" Figs. 2 and 3,'in order'toincrease its grasp hole, with the cap flange extending into the groove8, and then by means of suitable stak a relatively tight fit betweenparts that the which is capable of resisting effectively the hub-flange7' may be used, no reinforcing washer to take the clenched end of thehub flange is necessary, and the cap may be made of very much heaviermetal than has been previously used, with the result of economy massembling and increase in strength as compared with formerconstruct-ions, and a decided cheapening of the construction inaddition.

In a prior invention, Patent No. 87 7 ,326, dated January 21,v 1908, Iused a grooved hub and an outwardly extending cap flange, but thisflange has a vertical member and a horizontal member, requiring ahub-groove ofconslderable wldth and a closing pressure sufli'cient toembed the cap flange in the hub, and it was necessary to employ acomparatively thin metal in the cap. in order to effectively unite thehub and cap. Not only is the horizontal flange of the patent in questionomitted here, with -a resulting economy in manufacture, but the straightflange of the present invention admits of the straight, upright circularflange, and a hub having a flange inserted in said hub-hole and providedwith a shoulder having a groove which surrounds the hub-flange andreceives the cap-flange, the hub-flange being staked out flat within thecap, the metal of the cap around the hub-hole being gripped between thestaked-out hub-flange and the shoulder on the hub,thereby drawing thehub and cap into intimate non-rotating union.

2. Anelectric light socket cap or shell, made of thick metal and havinga hub-hole with an adjacent recess, and a surrounding outwardlyextending, straight, upright circular flange, and a hub having a knurledflange inserted in said hub-hole and provided with a shoulder having agroove which surrounds the hub-flange and receives the cap-flange, thehub-flange being staked out flat within the recess in the cap, the metalof the caps recess being gripped between the staked-out hub flange andthe shoulder on the hub, thereby drawing the hub and cap into intimatenon-rotating union.

In testimony whereof I have hereunto set my hand this 31st day ofDecember, A. D. 1910.

JOHN H. GOSS.

Witnesses:

CHAS. W. KELLoGe, G. F. Homes.

